681455775 has 192 divisors, whose sum is σ = 1569899520.
Its totient is φ = 251596800.
The previous prime is 681455743. The next prime is 681455777. The reversal of 681455775 is 577554186.
It can be divided in two parts, 68145 and 5775, that added together give a triangular number (73920 = T384).
681455775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 681455775 - 25 = 681455743 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (681455777) by changing a digit.
It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2177019 + ... + 2177331.
It is an arithmetic number, because the mean of its divisors is an integer number (8176560).
Almost surely, 2681455775 is an apocalyptic number.
681455775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.
681455775 is an abundant number, since it is smaller than the sum of its proper divisors (888443745).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
681455775 is a wasteful number, since it uses less digits than its factorization.
681455775 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 386 (or 381 counting only the distinct ones).
The product of its digits is 1176000, while the sum is 48.
The square root of 681455775 is about 26104.7079087279.
The cubic root of 681455775 is about 879.9930160431.
The spelling of 681455775 in words is "six hundred eighty-one million, four hundred fifty-five thousand, seven hundred seventy-five".